[英]SELECT from subquery in Codeigniter Active Record
How would I do the following query in Codeigniter ActiveRecord : - 如何在Codeigniter ActiveRecord中执行以下查询: -
SELECT *,
(SELECT
image_path
FROM
image
WHERE
image_table = 'model'
AND image_table_id = model_id
GROUP BY image_table_id
LIMIT 1) AS ModelImg
FROM
(SELECT
*
FROM
vw_newcars
where offer_table = 'derivative'
order by offer_order
) x
WHERE make_name = 'Fiat'
group by offer_table_id
limit 12
The part I'm having problems with is how to do a select from subquery in Active Record. 我遇到问题的部分是如何从Active Record中的子查询中进行选择。
I don't see a from_select
function or anything comparable in the documentation. 我没有在文档中看到
from_select
函数或类似的东西。
I managed to get the query to work by putting the from
sub_query into the initial select statement : 我设法查询通过将工作
from
sub_query到初始SELECT语句:
$this->db->select("*,
(select image_path from image where image_table = 'model' and image_table_id = model_id
group by image_table_id limit 1) as ModelImg FROM
(SELECT * FROM $view where offer_table = 'derivative' order by offer_order) x");
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